30 patients will be included from each of these three group of patients: 1) recurrent (> 5 attacks) idiopathic acute anterior uveitic with raised intraocular pressure; 2) recurrent (> 5 attacks) idiopathic acute anterior uveitic without raised intraocular pressure; 3) healthy age matched volunteers as controls. Patients on glaucoma treatment will be washed out for one month before measurement.